[
https://issues.apache.org/jira/browse/CASSANDRA-9193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14514622#comment-14514622
]
Benedict commented on CASSANDRA-9193:
-------------------------------------
I completely agree with [~slebresne] here. The internal APIs are really not a
good thing to expose in an API like this. Even full time developers get behind
on how they function at times, and the interfaces can vary dramatically.
Expecting anyone to interface with these is a bad idea, and likely to result in
ill will. Conversely, having the same scripts function across C* versions would
make this much more useful to teams deploying multiple clusters. I can also see
this being a really powerful tool used much more widely than those conversant
with the codebase.
> Facility to write dynamic code to selectively trigger trace or log for queries
> ------------------------------------------------------------------------------
>
> Key: CASSANDRA-9193
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9193
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Matt Stump
>
> I want the equivalent of dtrace for Cassandra. I want the ability to
> intercept a query with a dynamic script (assume JS) and based on logic in
> that script trigger the statement for trace or logging.
> Examples
> - Trace only INSERT statements to a particular CF.
> - Trace statements for a particular partition or consistency level.
> - Log statements that fail to reach the desired consistency for read or write.
> - Log If the request size for read or write exceeds some threshold
> At some point in the future it would be helpful to also do things such as log
> partitions greater than X bytes or Z cells when performing compaction.
> Essentially be able to inject custom code dynamically without a reboot to the
> different stages of C*.
> The code should be executed synchronously as part of the monitored task, but
> we should provide the ability to log or execute CQL asynchronously from the
> provided API.
> Further down the line we could use this functionality to modify/rewrite
> requests or tasks dynamically.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
